package com.zp.collection;

import java.util.HashSet;

public class SetTest {
	public static void main(String[] args) {
		
		HashSet<String> set = new HashSet<String>();
		
		set.add("a");
		set.add("b");
		set.add("c");
		
		System.out.println(set.add("a"));
		
		System.out.println(set);
	}
}
